Hi all at the moment i have a mac pro 1.1 with an ATI 3800 (don't recall if is the 3850 or 3870), and was planning to upgrade it. I've researched a bit and seems that the best choice would be the 5870 as upgrade for the old 1.1; now I have 2 questions: 1) how faster is the 5870 under windows and mac, compared to the 3800? 2) I may spend a bit more money to get a better card, since I am planning to upgrade to a newer mac pro (either 3.1 or 4.1); so in that case which card would you suggest me, to get something that I can use reliably also on the newer mac pro, but that works also on the 1.1 ? I am aware of course of the limitation of the bus PCI on the 1.1, so I don't expect that the card will use the full power, but if i can spend 100 or 200 dollars more and get a faster card, that may be perfect for the new mac pro I would consider that, instead than buying the 5870 and then have to spend more money in a year or so to upgrade the video card again. Thanks a lot!!!